kindergarten/lib/governesses/GermanGoverness.js

Kindergarten is a JavaScript library which helps programmers to achieve modular security using sandbox pattern

'use strict';

exports.__esModule = true;
exports.default = undefined;

var _createClass = function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }();

var _find = require('lodash/find');

var _find2 = _interopRequireDefault(_find);

var _HeadGoverness2 = require('./HeadGoverness');

var _HeadGoverness3 = _interopRequireDefault(_HeadGoverness2);

var _utils = require('../utils');

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

function _possibleConstructorReturn(self, call) { if (!self) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return call && (typeof call === "object" || typeof call === "function") ? call : self; }

function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function, not " + typeof superClass); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, enumerable: false, writable: true, configurable: true } }); if (superClass) Object.setPrototypeOf ? Object.setPrototypeOf(subClass, superClass) : subClass.__proto__ = superClass; }

/**
 * German governess loves rules. She automatically guards all exposed methods.
 * This means that she calls `guard()` and passes the name of the exposed
 * method as a first argument and arguments passed to exposed method as well.
 */
var GermanGoverness = function (_HeadGoverness) {
  _inherits(GermanGoverness, _HeadGoverness);

  function GermanGoverness() {
    _classCallCheck(this, GermanGoverness);

    return _possibleConstructorReturn(this, (GermanGoverness.__proto__ || Object.getPrototypeOf(GermanGoverness)).apply(this, arguments));
  }

  _createClass(GermanGoverness, [{
    key: 'governed',

    /**
     * The overriden governed method of the HeadGoverness, that calls guard
     * method before any exposed method is executed. The first parameter passed
     * to guard method will be the name of the exposed method. So make sure the
     * name of exposed method and rule is the same when defining a perimeter.
     */
    value: function governed(callback) {
      var args = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : [];
      var callingContext = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : null;

      var guardArgs = args;

      guardArgs.unshift(this._detectNameOfExposedMethod(callingContext, callback));

      // Call the guard method on each exposed method
      this.guard.apply(this, guardArgs);

      return _HeadGoverness3.default.prototype.governed.call(this, callback, args, callingContext);
    }

    /**
     * Find the method in the perimeter.
     */

  }, {
    key: '_detectNameOfExposedMethod',
    value: function _detectNameOfExposedMethod(perimeter, method) {
      if ((0, _utils.isPerimeter)(perimeter)) {
        return (0, _find2.default)(perimeter.expose || [], function (m) {
          return perimeter[m] === method;
        });
      }

      throw new Error('German governess can only be used within sandbox.');
    }
  }]);

  return GermanGoverness;
}(_HeadGoverness3.default);

exports.default = GermanGoverness;